Features： 1、Adjust up and down as well as the tightness according to your own conditions, double belt stretch adjust shoulder tension at will. 2、Comfortable, breathable, light posture correction belt, use 3Y cross plastic line orthotic method. 3、Shoulder, back, waist, side rib full of 360 degrees of balanced force, to achieve the waist, slim, straight back effect. 4、Close to the shoulder curve, which disperses the pressure of the guide belt. The fixed force point on the shoulder to form the horizontal tension in the vertical direction of the body. 5、Y design with broad shoulders, no friction with the back neck during wearing, reduce body load, comfortable to wear, suitable for all seasons Specification： Item Type: Posture Corrector Belt Material: High performance fiber rubber + nylon + polyester fiber SizeSuitable WaistSuitable HeightSuitable Weight XL 50cm / 19.7in100-130cm / 39.4-51.2in15 ~ 25kg / 33.1 ~ 55.1lb S 33-66cm / 13-26in125-155cm / 49.2-61in25 ~ 45kg / 55.1 ~ 99.2lb M66-80cm / 26-31.5in150-170cm / 59.1-66.9in45 ~ 65kg / 99.2 ~ 143.3lb L80-93cm / 31.5-36.6in160-180cm / 63-70.9in60 ~ 75kg / 132.3 ~ 165.3lb XL 96-106cm / 37.8-41.7in165-185cm / 65-72.8inAbove 80kg / 176.4lb Features: 1. Thin and thin, it can be worn concealing at home or outside. The two aluminum strips on the back can provide better support, the hollow mesh surface on the back can breathe better, and the shoulder pad can prevent the shoulder from tightening 2. The net fabric is light, soft, comfortable, hygroscopic and breathable with high lightness and lightness. With the integrated molding process, the air permeability of the back, waist and shoulders can be increased, the wearing is not tight, the spine can be protected, the skin can be friendly, and the body can enjoy more comfortable posture every day. Applicable Scope: 1. Teenagers' bad posture of sitting, standing and walking can prevent them from habitually bending down, hunchback with chest and using eyes in close range 2. Relieve the back pain caused by standing for a long time, sitting at a desk for a long time and holding the same position for a long time Usage: Step 1: Stretch your arms and put on the adjusting straps to fit. Step 2: Pull level downward, adjust abdomen position, stick good abdomen hair to drill surface. Step 3: Pull the end of the double Y cross lead band to the abdomen, and bond it after proper adjustment of tension. Step 4: two adjustment belt after sticking up straight back, erect and graceful! When using this product, try to straighten your back, wear this product flat on your body, compress the hook face and hair face of sticking-type buckle, pull the end of the double Y cross lead tape to the shoulder to adjust to the best position, and stick with the protection buckle to achieve the best tension effect. Notes: 1. In the first 3 days, the wearer should not be too tight, but should be moderately tight. Starting from 1-2 hours, gradually strengthen to appropriate, and initially develop the habit of wearing./2. Properly increase the pulling force and stick to it every day [wear it for 2 hours for 21 consecutive days, correct the bad posture Package List： 1 x Posture Corrector Belt